同意按钮，倒计时10秒

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<form>
<input type="submit" id="t" value="同意（9）"  disabled="disabled" />
</form>
</body>
</html>
<script>
var n=10;
var a=document.getElementById("t");
function bian()
{
    n--;
    if(n==0)
    {
        a.removeAttribute("disabled");
        a.value="同意";
        return;
        
        }
    else
    {
        a.value="同意（"+n+"）";
        window.setTimeout("bian()",1000);
        }
    }
window.setTimeout("bian()",1000);
</script>
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